In the sentence given below, one word has been omitted. Write the missing word along with the words that come before it and after it. Pollution not a new problem. A. Pollution is not B. Pollution will not C. Pollution had not D. Pollution was not

The correct answer is: Pollution is not a new problem.

The other options are incorrect because they do not make sense in the context of the sentence.

• Pollution will not a new problem is grammatically incorrect. The verb “will not” does not agree with the subject “pollution.”
• Pollution had not a new problem is also grammatically incorrect. The verb “had not” does not agree with the subject “pollution.”
• Pollution was not a new problem is the correct answer. The verb “was not” agrees with the subject “pollution.”

In addition, the other options do not make sense in the context of the sentence. For example, pollution will not a new problem does not make sense because pollution is already a problem. Pollution had not a new problem does not make sense because pollution has always been a problem.

Therefore, the correct answer is: Pollution is not a new problem.